It is not that unusual for your established fish to get a bit excited over new additions. Chances are that the addition of the H. Rasboras will get the same response. The new additions of Rasboras should max out your bio load, but the selection you have, and will have is a pretty peaceful group. The gourami may get a bit feisty of each other, but the tank is large enough for the Gourami hierarchy to settle in.